president obama consoled the families and survivors telling a weeping crowd that he will use all the powers his office can bear to keep something like this from happening once again. >> the investigation continues. the tight knit community and everyone across the country trying to understand the "why." why a 20-year-old young man who was smart enough to take college courses at the age of 16 could commit such a heinous crime? why a well-to-do mother would have a collection of heavy duty weapons which police say her son used to shoot her in the head, four times, that morning, in her pajamas before he took the same guns to the school to kill innocent children. the guns were her way to connecting with her troubled son. >> she was trying to bond, find ways to bond with him and she told me the guns, she would take them shooting because that was a way a single mom could relate to her son. she would take him out shooting. >>reporter: family and friends describe the shooter as a socially awkward loner but they do not know why he snapped. we start the hour with our team fox coverage with jonat